Coralife BioCube Original Filter Cartridge Replacements， 2-Pack</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Replacement BioCube Filter Cartridge， 2-Pack， for all the Oceanic BioCube Aquariums and Coralife BioCube Aquariums</li><li>This is the Oceanic BioCube Size 8， 14 & 29 Filter， and Coralife Size 14， 16， 29 & 32 Filter</li><li>If you have a BioCube， this is the replacement filter</li><li>Coralife recommends， for optimum efficiency， cartridges should be replaced every four to six weeks</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/11dKrij5epL.jpg' noproxy></br>